Update config.json

config.json

@@ -29,6 +29,6 @@
       "tokenization_bert2d_fast.Bert2DTokenizerFast"
     ]
   },
-  "tokenizer_class": "tokenization_bert2d.Bert2DTokenizer"
+  "tokenizer_class": "tokenization_bert2d.Bert2DTokenizer",
   "tokenizer_class_fast": "tokenization_bert2d_fast.Bert2DTokenizerFast"
 }